Shock-absorber and safety attachment for percussion-operated tools.



G. C 00K.

Patented June 8, 1915.

IIIIIIII IIIII .'IIIII GEORGE COOK, 0F SIOUX CITY, IOWA.

. SHOCK-ABSORBER AND SAFETY ATTACHMENT FOR PERCUSSION-OPERATED TOOLS.

To all whom it may concern Be it known that I, GEORGE COOK, a citizen of the United States, and a resident of Sioux City, in the county of Woodbury and State of Iowa, have invented certain new and useful Improvements in Shock-Absorbers and Safety Attachments for Percussion- Operated Tools, of which the following is a specification.

The present invention relates tol means for absorbing the shock and preventing displacement of percussion-operated tools.

The invention has for its primary object the production of an improved shook-absorbing device which may be readily attached to and detached from' pneumatic hammers.

Anotherobject of the invention is the provision in a device of this class of means for preventing the driven tool from being thrust entirely from the hammer.

With these and other objects in view, the inventi/on, consisting in the construction, combination and novel arrangement of parts, will be fully understood from the following description, reference being had to the accompanying drawings which form a part of this application and in which like characters of reference indicate corresponding parts throughout the several views, of which- Figure 1 is a longitudinal section of a device constructed in accordance with the in- I the tool, 6, protruding from the barrel. The

vention and attached to a pneumatic hammer; Fig. 2 is a longitudinal section of the driven tool, the head thereof being cut away; and Fig. 3 is a perspective View of the retaining collar.

Referring now to the illustrations, 4 represents the barrel of a pneumatic hammer, inclosing the usual plunger, 5, which drives tool, 6, ha's the customary head which aords a shoulder, 7; and the shank of the toolis formed with an intermediate shoulder, 8.

9 is a cylindrical casing threaded upon the v end of the barrel and provided with an internal rim, 10, adjacent its outer end, and freely encircling a collar, 11, having a ange, 12, engaged by the rim. The casing freel incloses a split collar, 13, comprising duplicate semi-cylindrical halves, each having in its end' opposite from the barrel, an inner shoulder, 14.

The driven' tool is encircled by both the Specication of Letters Patent.

Patented June 8, 1915.

Application tiled August 31, 1914. Serial No. 859,538.

collar 11 and the split collar, the former engageable with the head of the tool and the latter inclosing the shouldered part 8 of the shank, said shouldered part being engageable with the shoulder 14. The collars are yieldably separated as by a compressionspring, 15. As the tool is so inclosed and reciprocates so rapidly, the tendency to heat is overcome by providing a longitudinal bore, 16, which extends through theshank of the tool and communicates with forwardly-disposed lateral bores, 17.

To apply the device, the driven tool having been first mounted with the collars and spring, is introduced into the casing and the latter then screwed upon the barrel of the hammer. y

In operation the split coll-ar prevents the tool from being thrust entirely from the hammer, and when the tool rebounds from the work, the shock is absorbed by the yieldably-mounted collar, 11.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is,

In an article of the class described, a percussion-operated tool and'operating mechanism therefor includingf a barrel and a plunger reciprocating therein, said tool having two shoulders, in combination with a vcylindrical casing adapted to freely inclosc the shank of the tooll and having an internal rim in one end and threaded at the other end for engagement with the barrel, a collar freely inclosed by the casing, adapted to receive the shank of the tool and engage one of the shoulders thereof and having a flange to engage said rim, a second collar inclosed by said casing and adapted to receive the shank of the tool, said second collar being divided longitudinally in two parts, each part having' an internal shoulder adapted for engagement by the shoulder opposite to that engaged by saidfirst collar, and a compression-spring interposed between said collars.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit. nesses.

M. S. CRANDALL, C. MERION Hlcxs. 

